HEXA

ENGINE 160 1.9 ENGINE MANAGEMENT SYSTEM (EMS) DESCRIPTION Engine Management System ( EMS ) comprises of Electronic Control Unit ( ECU ), sensors, actuators and control algorithms that determine the perfor- mance of the Engine as a whole and as part of the vehicle. The Electronic control Unit consist of a 32 bit micro- processor with peripheral devices like ignition driver, ADCs device and I/O drivers. Microprocessor con- trols the injection parameters as well as some of the vehicle related outputs such as Fan, AC, drivability, turbocharger, EGR etc. The ECU receives input from various sensors located on the engine and the vehicle, and decides the injection quantity, injection timing, number of injections best suited for the en- gine to work with maximum efficiency and safety. It is the ‘Brain’ of the Engine Management System. Being the most important component of the Engine management system, ECU apart from ensuring the optimum working of the Vehicle, also keeps an eye on the working of the sensors and actuators. When ever a malfunction/fault occurs in the component or the system the ECU alerts the user by glowing MIL indicator on instrument cluster. ECU also does the following:  Stores a DTC in its memory ( indicates the faulty component/system ).  Stores a context frame ( list of parameters indicat- ing the operating condition during the fault generation ) in its memory.  When the malfunction poses a threat to the vehi- cle, the ECU with its control algorithms operates the vehicle in safe mode. This protects the com- ponent from damage with some degradation in performance of the vehicle.  EMS gets the vehicle electrical load via DF signal and adjusts the Idling torque if necessary to meet the electrical load requirements. NOTE For certain faults and for failure of some sensors the EMS switches to reduced torque or limp home mode. During this mode the vehicle performance will be restricted and MIL lamp will be ON. MAKE: Delphi Diesel System MODEL / TYPE: DCM 3.7